Hi Taen and welcome to the forum :-)
About the report: if you select the parameter in question to be displayed in the WSS site when you publish the customer information form, you could use that parameter as a secondary data source in your IP report ( tools > data connections > add > recieve > sharepoint... > url to site that contains Customer form > select field.)
About Public Folders, im not sure. You would need to either hook up on the hierarchial database beneath Exchange or get your folder output in a structured way like XML.
AFAIR you can do that using the following syntax
http://<exchangeserver>/public/<folderpath>/?cmd=contents&part=1
but when i tried it on some of our folders it didnt work, so im not sure.
Try and search MSDN for ways to output the folders as xml.
hth